页面中的JSF错误-无法获取或设置bean的值_Jsf_Jsf 2

页面中的JSF错误-无法获取或设置bean的值

jsf jsf-2

页面中的JSF错误-无法获取或设置bean的值,jsf,jsf-2,Jsf,Jsf 2,我要用JSF做一个web应用程序，只是为了从JSF获取一个值并将其放入bean，反之亦然。我想我已经做了所有正确的事情，但是当我启动服务器并尝试访问我的第一个页面时，我得到了以下错误 SEVERE: Servlet.service() for servlet [jsp] in context with path [/SimpleJSF] threw exception [/greeting.jsp (line: 20, column: 85) #{...} is not allowed in t

我要用JSF做一个web应用程序，只是为了从JSF获取一个值并将其放入bean，反之亦然。我想我已经做了所有正确的事情，但是当我启动服务器并尝试访问我的第一个页面时，我得到了以下错误

SEVERE: Servlet.service() for servlet [jsp] in context with path [/SimpleJSF] threw exception [/greeting.jsp (line: 20, column: 85) #{...} is not allowed in template text] with root cause
org.apache.jasper.JasperException: /greeting.jsp (line: 20, column: 85) #{...} is not allowed in template text

我将EclipseHelios与JDK1.6、ApacheTomcat7和JSF2.0框架一起使用

这是我的代码片段

greeting.jsp

<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html 
xmlns="http://www.w3.org/1999/xhtml" 
xmlns:f="http://java.sun.com/jsf/core" 
xmlns:h="http://java.sun.com/jsf/html">
<h:head>
        <title>Guess Number Facelets Application</title>
    </h:head>
    <h:body>
        <h:form>

            <h2>
                Hi, my name is Duke. I am thinking of a number from
                0 to 10.
                Can you guess it?
            </h2>
            <p><h:inputText id="userNo" title="Type a number from 0 to 10:" value="#{resultNumber.userNumber}">
                    <f:validateLongRange minimum="#{resultNumber.minimum}" maximum="#{resultNumber.maximum}"/>
                </h:inputText>

                <h:commandButton id="submit" value="Submit" action="response.jsp"/>
            </p>
            <h:message showSummary="true" showDetail="false" style="color: #d20005; font-family: 'New Century Schoolbook', serif; font-style: oblique; text-decoration: overline"
                       id="errors1"
                       for="userNo"/>

        </h:form>
    </h:body>
</html>

<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Insert title here</title>
 <h:head>
        <title>Guess Number Facelets Application</title>
    </h:head>
    <h:body>
        <h:form>

            <h2>
                <h:outputText id="result" value="#{resultNumber.response}"/>
            </h2>
            <h:commandButton id="back" value="Back" action="greeting.xhtml"/>
        </h:form>
    </h:body>

</html>

现在来看配置文件

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>SimpleJSF</display-name>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
  </servlet-mapping>
  <context-param>
    <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>
  <context-param>
    <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
    <param-value>resources.application</param-value>
  </context-param>
  <listener>
    <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
  </listener>
  <welcome-file-list>
    <welcome-file>faces/greeting.jsp</welcome-file>
  </welcome-file-list>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
    <managed-bean>
        <managed-bean-name>resultNumber</managed-bean-name>
        <managed-bean-class>guessNumber.ResultNumber</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
    </managed-bean>
</faces-config>


SimpleJSF
Facesservlet
javax.faces.webapp.FacesServlet
1.
Facesservlet
/面孔/*
状态保存方法：“客户端”或“服务器”（=默认值）。参见JSF规范2.5.2
javax.faces.STATE_保存方法
客户
javax.servlet.jsp.jstl.fmt.localizationContext
资源.应用
com.sun.faces.config.ConfigureListener
faces/greeting.jsp

facet config.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>SimpleJSF</display-name>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
  </servlet-mapping>
  <context-param>
    <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>
  <context-param>
    <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
    <param-value>resources.application</param-value>
  </context-param>
  <listener>
    <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
  </listener>
  <welcome-file-list>
    <welcome-file>faces/greeting.jsp</welcome-file>
  </welcome-file-list>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
    <managed-bean>
        <managed-bean-name>resultNumber</managed-bean-name>
        <managed-bean-class>guessNumber.ResultNumber</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
    </managed-bean>
</faces-config>


结果编号
guessNumber.ResultNumber
一场

您使用的是.jsp文件，因此您应该手动导入标记库。请将这两行添加到您的html开始标记的正上方

<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

在JSF2.0中，JSP被弃用为视图技术，Facelets继承了JSP。您需要将

.jsp

文件重命名为

.xhtml

文件。在您的情况下，还需要删除两个JSP中的整个

行。然后需要使用URL中的

.xhtml

扩展名调用它们

此外，您还需要从

web.xml

中删除

ConfigureListener

，并且需要将JSP欢迎文件重命名为XHTML。我还建议使用

*.xhtml

而不是

/faces/*

作为

FacesServlet

URL模式。这样，您就不必每次都在URL中添加

/faces/*

。最后，您需要从

faces config.xml

中删除bean，并对bean进行如下注释，而不是那些

javax.ejb

注释：

import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

@ManagedBean
@RequestScoped
public class ResultNumber {

毕竟，您似乎在阅读JSF1.x教程，并将其与JSF2.x混合在一起。您应该非常小心正在阅读的JSF书籍/教程的JSF版本。自从JSF2.0以来，很多事情都是以不同的方式完成的